add misc/nonblocking.h

misc/nonblocking.h

@@ -0,0 +1,44 @@
+/**
+ * @file nonblocking.h
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * This file is part of BadVPN.
+ * 
+ * BadVPN is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ * 
+ * BadVPN is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * @section DESCRIPTION
+ * 
+ * Function for enabling non-blocking mode for a file descriptor.
+ */
+
+#ifndef BADVPN_MISC_NONBLOCKING_H
+#define BADVPN_MISC_NONBLOCKING_H
+
+#include <unistd.h>
+#include <fcntl.h>
+
+static int badvpn_set_nonblocking (int fd);
+
+int badvpn_set_nonblocking (int fd)
+{
+    if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
+        return 0;
+    }
+    
+    return 1;
+}
+
+#endif